1656249880 has 32 divisors (see below), whose sum is σ = 3730202640. Its totient is φ = 661852800.

The previous prime is 1656249869. The next prime is 1656249901. The reversal of 1656249880 is 889426561.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22342 + ... + 61738.

Almost surely, 2^1656249880 is an apocalyptic number.

1656249880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1656249880 is an abundant number, since it is smaller than the sum of its proper divisors (2073952760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1656249880 is a wasteful number, since it uses less digits than its factorization.

1656249880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40459 (or 40455 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

The square root of 1656249880 is about 40697.0500159410. The cubic root of 1656249880 is about 1183.1558442165.

The spelling of 1656249880 in words is "one billion, six hundred fifty-six million, two hundred forty-nine thousand, eight hundred eighty".